Changeset 8653 in vbox for trunk

Timestamp:

May 7, 2008 12:31:30 PM (17 years ago)

Author:

vboxsync

Message:

Added RTSemRWIsWriteOwner, RTSemRWGetWriteRecursion and RTSemRWGetWriterReadRecursion.

Location:

trunk

Files:

• include/iprt/semaphore.h (modified) (1 diff)
• src/VBox/Runtime/r3/posix/semrw-posix.cpp (modified) (1 diff)

trunk/include/iprt/semaphore.h

@@ -338 +338 @@
  */
 RTDECL(int)   RTSemRWReleaseWrite(RTSEMRW RWSem);
+
+/**
+ * Checks if the caller is the exclusive semaphore owner.
+ *
+ * @returns true / false accoringly.
+ * @param   RWSem       The Read/Write semaphore in question.
+ */
+RTDECL(bool)  RTSemRWIsWriteOwner(RTSEMRW RWSem);
+
+/**
+ * Gets the write recursion count.
+ *
+ * @returns The write recursion count (0 if bad semaphore handle).
+ * @param   RWSem       The Read/Write semaphore in question.
+ */
+RTDECL(uint32_t) RTSemRWGetWriteRecursion(RTSEMRW RWSem);
+
+/**
+ * Gets the read recursion count of the current writer.
+ *
+ * @returns The read recursion count (0 if bad semaphore handle).
+ * @param   RWSem       The Read/Write semaphore in question.
+ */
+RTDECL(uint32_t) RTSemRWGetWriterReadRecursion(RTSEMRW RWSem);
 
 

trunk/src/VBox/Runtime/r3/posix/semrw-posix.cpp

@@ -430 +430 @@
 }
 
+
+RTDECL(bool) RTSemRWIsWriteOwner(RTSEMRW RWSem)
+{
+    /*
+     * Validate input.
+     */
+    struct RTSEMRWINTERNAL *pThis = RWSem;
+    AssertPtrReturn(pThis, false);
+    AssertMsgReturn(pThis->u32Magic == RTSEMRW_MAGIC,
+                    ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic),
+                    false);
+
+    /*
+     * Check ownership.
+     */
+    pthread_t Self = pthread_self();
+    pthread_t Writer;
+    ATOMIC_GET_PTHREAD_T(&pThis->Writer, &Writer);
+    return Writer == Self;
+}
+
+
+RTDECL(uint32_t) RTSemRWGetWriteRecursion(RTSEMRW RWSem)
+{
+    /*
+     * Validate input.
+     */
+    struct RTSEMRWINTERNAL *pThis = RWSem;
+    AssertPtrReturn(pThis, 0);
+    AssertMsgReturn(pThis->u32Magic == RTSEMRW_MAGIC,
+                    ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic),
+                    0);
+
+    /*
+     * Return the requested data.
+     */
+    return pThis->cWrites;
+}
+
+
+RTDECL(uint32_t) RTSemRWGetWriterReadRecursion(RTSEMRW RWSem)
+{
+    /*
+     * Validate input.
+     */
+    struct RTSEMRWINTERNAL *pThis = RWSem;
+    AssertPtrReturn(pThis, 0);
+    AssertMsgReturn(pThis->u32Magic == RTSEMRW_MAGIC,
+                    ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic),
+                    0);
+
+    /*
+     * Return the requested data.
+     */
+    return pThis->cWriterReads;
+}